Just like we do every else (sometimes even on that very same file), we
use the method instead of the instance variable.
We're doing this change now because we're about to modify one of these
files (the poll question answers documents index component).
The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.
Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.
Note we could use `acts_as_paranoid` with the `without_default_scope`
option, but we aren't doing so because it isn't possible to consider
deleted records in uniqueness validations with the paranoia gem [1].
I've added tests for these cases so we don't accidentally add
`acts_as_paranoid` in the future.
Also note we're extracting a `RowComponent` because, when
enabling/disabling a tenant, we're also enabling/disabling the link
pointing to its URL, and so we need to update the URL column after the
AJAX call.
[1] See issues 285 and 319 in https://github.com/rubysherpas/paranoia/
In general, we don't use links inside admin tables because we don't know
where the link will point to, and use "view" actions/links instead.
However, in this case, we're showing a URL, so it's perfectly obvious
where the link will point to. And so it makes sense to use the URL as a
link instead of using a "view" action/link.
Some institutions using CONSUL have expressed interest in this feature
since some of their tenants might already have their own domains.
We've considered many options for the user interface to select whether
we're using a subdomain or a domain, like having two separate fields,
using a check box, ... In the end we've chosen radio buttons because
they make it easier to follow a logical sequence: first you decide
whether you're introducing a domain or subdomain, and then you enter it.
We've also considered hiding this option and assuming "if it's got a
dot, it's a domain". However, this wouldn't work with nested subdomains
and it wouldn't work with domains which are simply machine names.
Note that a group of radio buttons (or check boxes) is difficult to
style when the text of the label might expand over more than one line
(as is the case here on small screens); in this case, most solutions
result in the second line of the label appearing immediately under the
radio button, instead of being aligned with the first line of the label.
That's why I've added a container for the input+label combination.
Note we aren't allowing to delete a tenant because it would delete all
its data, so this action is a very dangerous one. We might need to add a
warning when creating a tenant, indicating the tenant cannot be
destroyed. We can also add an action to delete a tenant which forces the
admin to write the name of the tenant before deleting it and with a big
warning about the danger of this operation.
For now, we're letting administrators of the "main" (default) tenant to
create other tenants. However, we're only allowing to manage tenants
when the multitenancy configuration option is enabled. This way the
interface won't get in the way on single-tenant applications.
We've thought about creating a new role to manage tenants or a new URL
out of the admin area. We aren't doing so for simplicity purposes and
because we want to keep CONSUL working the same way it has for
single-tenant installations, but we might change it in the future.
There's also the fact that by default we create one user with a known
password, and if by default we create a new role and a new user to
handle tenants, the chances of people forgetting to change the password
of one of these users increases dramatically, particularly if they
aren't using multitenancy.
